CRRL spectra observed toward the northern part of the ISF with the Effelsberg 100 m radio telescope. The CRRL is an average of the C109α and C102α lines. We compare the averaged CRRL to the averaged HRRL (an average of the H109α and H102α lines, on the left), the FIR [CII] and [¹³CII] F = 2– 1 lines (center), and HCN(1–0) and C₂ H(1–0) (right). In the center panels the [¹³CII] F = 2– 1 line is scaledto match the peak of the averaged CRRL, while on the right panels the CRRL is scaled to match the peak of the HCN(1–0) line.